CN211789355U

CN211789355U - Lithium battery management system

Info

Publication number: CN211789355U
Application number: CN202020805776.1U
Authority: CN
Inventors: 饶华兵; 刘坤富; 何振良
Original assignee: Guangdong Liwei Technology Co Ltd
Current assignee: Guangdong Liwei Technology Co Ltd
Priority date: 2020-05-14
Filing date: 2020-05-14
Publication date: 2020-10-27
Anticipated expiration: 2030-05-14

Abstract

A lithium battery management system comprises a micro control module and N voltage acquisition circuits for acquiring charging and discharging information of lithium battery cores, wherein each voltage acquisition circuit comprises an analog front end module and a displacement cache module, each analog front end module of the N voltage acquisition circuits is cascaded with the micro control module through the corresponding displacement cache module, a time sequence switching voltage acquisition circuit is used for monitoring and managing each battery core of a lithium battery, and a level conversion circuit is connected between the displacement cache modules and the micro control modules of the rest voltage acquisition circuits except the first-stage voltage acquisition circuit; the cost is lower than that of the same digital front end in the market by using the analog front end module, and an expensive isolation chip is saved, so that the cost is further reduced; the low-voltage control signal is converted into the control signal of the high-end cascade chip through the level conversion module, the isolation problem of a high-voltage circuit and a weak-current circuit does not need to be considered, and the high-voltage problem and the failure problem of the isolation chip are avoided.

Description

Lithium battery management system

Technical Field

The utility model belongs to the technical field of battery management and specifically relates to a lithium battery management system is related to.

Background

With the rapid development of new energy industries, battery management systems as main components in lithium batteries are also rapidly developed. In the process of rapid development, problems such as battery fire explosion and the like are often caused, and more people have cautious and doubtful attitudes on the use of the lithium battery. Therefore, the current market has higher and higher requirements on the battery management system, the cost is controlled, the performance is pursued, the battery is required to be abstracted into an image, and a good battery management system ensures safety and reliability, can prolong the service life of the battery, and can ensure the user to be relieved, save worry and be safe.

The single board scheme of the battery management system in the current market mainly comprises the following steps: discrete device scheme, digital front-end chip cascade scheme, hardware front-end chip cascade scheme.

The scheme of the discrete device is built by using an analysis device as the name implies, has no advantages in cost, stability and space, particularly stability, and is easy to be infected and damaged. This solution belongs to the early battery management chip starvation and instability stage, now essentially out of service at higher string numbers.

The digital front-end chip cascade scheme, the intelligent battery management system scheme of the mainstream at present, this scheme cascades with many chips, and a microcontroller and each chip communication of collocation again, here needs to handle communication isolation and signal isolation problem strictly, and microcontroller needs comparatively abundant peripheral hardware resource moreover, in addition, this scheme is with high costs, mainly focuses on digital front-end chip and communication, signal isolation chip.

Although the scheme is low in cost, the flexibility is poor, the intellectualization is extremely low, for example, protection parameters and time cannot be changed, basic data such as voltage and temperature of a battery cannot be obtained, different electric core systems cannot be compatible, and the like, and great inconvenience is brought to production material preparation, after-sale service and the like.

In fact, there are many analog front-end chips on the market, such chips only output analog signals to the microcontroller for collection, thereby obtaining the basic data of the battery, and such chips have a significant price advantage over digital front-end chips, only the current analog front-end chips are used as a single chip. The utility model discloses just utilize the simulation front end to cascade the realization and to the collection of battery data, not only control the cost, need not do communication or signal isolation moreover, can send the battery data for mobile device and realize the control to the battery through the form of broadcasting simultaneously.

SUMMERY OF THE UTILITY MODEL

The utility model discloses an it is not enough to overcome above-mentioned condition, aims at providing the technical scheme that can solve above-mentioned problem.

The utility model provides a lithium battery management system, includes little the control module, still includes N voltage acquisition circuit of gathering lithium cell electricity core information, and voltage acquisition circuit includes simulation front end module and displacement cache module, every simulation front end module of N voltage acquisition circuit cascades with little the control module through corresponding displacement cache module, realizes that chronogenesis switching voltage acquisition circuit monitors the management to every electric core of lithium cell to except that first level voltage acquisition circuit, still be connected with level conversion circuit between the displacement cache module of all the other voltage acquisition circuits and the little the control module.

Furthermore, the micro control module adopts the model of ″)N76E003AT20"is used as a control chip.

Furthermore, the displacement cache module adopts a displacement register chip with the model number of "SN 74HC595 DR", and the No. 12 pin of the displacement cache module is connected with the No. 16 pin of the micro control module; the No. 13 pin of the displacement cache module is also connected with the No. 17 pin of the micro control module; and the No. 12 pin to the No. 14 pin of the micro control module are used as control end pins and are connected with the No. 14 pin of the displacement cache module of each voltage acquisition circuit, and the No. 12 pin, the No. 13 pin and the No. 14 pin of the displacement cache modules of the other voltage acquisition circuits are connected with the micro control module in common through level conversion circuits except for the first-stage voltage acquisition circuit.

Furthermore, the analog front-end module adopts an IC chip with the model number of PT 6111; the No. 12 pin to the No. 19 pin of the analog front-end module of each voltage acquisition circuit are respectively and independently connected with the No. 15 pin, the No. 7 pin, the No. 6 pin, the No. 5 pin, the No. 1 pin, the No. 4 pin, the No. 3 pin and the No. 2 pin of the corresponding displacement cache module; and the No. 11 pin of the analog front-end module of the upper-stage voltage acquisition circuit is connected with the No. 11 pin of the displacement cache module of the lower-stage voltage acquisition circuit for cascade switching.

In the above embodiment, the micro control module 1 outputs the control timing signal, the signal passes through the level shift circuit 5 and is output to the shift buffer module 4, and after the shift buffer module 4 latches the control signal, the micro control module 1 enables the shift buffer module 4 to output the control signal to the BS0, BS1, BS2, BL, and EN pins of the IC chip U1/U5/U8.

Furthermore, the power supply management module is connected with a main power supply, the main power supply is subjected to voltage reduction and then output to the micro control module and other peripheral modules connected with the micro control module to supply power, and the No. 18 pin and the No. 8 pin of the micro control module are connected with the power supply management module.

Furthermore, the current detection module is used for collecting charging and discharging current in the circuit, the current detection module adopts an operational amplifier chip with the model number of TP199A1-CR, and the No. 4 pin of the current detection module is connected with the No. 19 pin of the micro control module.

Furthermore, the micro-control module also comprises a short circuit detection module for detecting the short circuit state, and the short circuit detection module is connected with the No. 11 pin and the No. 20 pin of the micro-control module.

The charging and discharging system further comprises a Bluetooth module, wherein the Bluetooth module is responsible for playing charging and discharging information of the lithium battery cell through network data; the Bluetooth module adopts a "beacon" type Bluetooth chip; no. 12 pin of the Bluetooth module is connected with No. 2 pin of the micro control module.

The micro-control module is characterized by further comprising an MOSFET driving module, wherein the MOSFET driving module is used for conducting or opening a charge-discharge loop, and is connected with the No. 1 pin and the No. 3 pin of the micro-control module; and the MOSFET driving module is also used for carrying out turn-off locking through the short circuit detection module.

Further, the load detection module is used for detecting the removal condition of the load of the MOSFET driving module in the turn-off state, and the load detection module is connected with the No. 15 pin of the micro-control module.

Compared with the prior art, the beneficial effects of the utility model are that:

the cost is lower than that of the same digital front end in the market by using the analog front end module, and an expensive isolation chip is saved, so that the cost is further reduced;

the low-voltage control signal is converted into the control signal of the high-end cascade chip through the level conversion module, the isolation problem of a high-voltage circuit and a weak-current circuit does not need to be considered, and the high-voltage problem and the failure problem of the isolation chip are avoided;

by adopting the Beacon Bluetooth as an external communication mode, the Bluetooth communication system has the advantages of low cost, high reliability, high safety factor and the like, and no extra wiring is needed, so that the accident caused by more wiring harnesses is avoided; the Beacon Bluetooth broadcast data is provided to the mobile terminal equipment, the mobile terminal equipment visualizes and fools the battery, and the mobile terminal equipment prompts the user of battery abnormity by using the vibration and voice functions of the mobile phone;

the short circuit is simply divided into two possibilities of true and false, the true and false short circuit is identified through a low-cost and simple circuit, the problem that the short circuit cannot be used due to misinformation caused by capacitive load of the whole vehicle in all states can be avoided, and the problem that sparks are generated instantly when the whole vehicle is connected can be avoided through a pre-discharge loop;

the device can be compatible with wide-range capacitive loads, has extremely high flexibility, and avoids the problem that different vehicles need to change hardware;

the problems that an analog circuit cannot diagnose a battery, check battery information and misreport short circuits can be solved in a low-cost and high-reliability mode, and the problems that a digital chip is high in cost and needs high-voltage isolation are solved;

additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

Fig. 1 is a connection diagram of the middle module of the present invention.

Fig. 2 is a circuit diagram of the micro control module of the present invention.

Fig. 3 is a circuit diagram of the medium voltage acquisition circuit of the present invention.

Fig. 4 is a circuit diagram of the medium voltage acquisition circuit and the level shift circuit of the present invention.

Fig. 5 is a specific circuit diagram of the medium voltage acquisition circuit of the present invention.

Fig. 6 is a circuit diagram of the middle power management module of the present invention.

Fig. 7 is a circuit diagram of the medium current detection module of the present invention.

Fig. 8 is a circuit diagram of the middle short circuit detection module of the present invention.

Fig. 9 is a circuit diagram of the bluetooth module of the present invention.

Fig. 10 is a circuit diagram of a MOSFET driver module according to the present invention.

Fig. 11 is a circuit diagram of the middle load detection module of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it should be understood that the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Please refer to fig. 1-11, in the embodiment of the utility model, a lithium battery management system, including little control module 1, still include a voltage acquisition circuit 2 of 12 information of N collection lithium battery electricity core, voltage acquisition circuit 2 includes simulation front end module 3 and displacement cache module 4, every simulation front end module 3 of a N voltage acquisition circuit 2 cascades with little control module 1 through corresponding displacement cache module 4, realizes that chronogenesis switches voltage acquisition circuit 2 and monitors the management to every electric core of lithium battery to except that first level voltage acquisition circuit 2, still be connected with level conversion circuit 5 between displacement cache module 4 of all the other voltage acquisition circuits 2 and little control module 1.

As further shown in fig. 2, the micro control module 1 has a model ″)N76E003AT20"is used as a control chip.

As further shown in fig. 3 to 5, the displacement cache module 4 adopts a displacement register chip with a model number "SN 74HC595 DR", and a pin No. 12 of the displacement cache module 4 is connected to a pin No. 16 of the micro control module 1; the No. 13 pin of the displacement cache module 4 is also connected with the No. 17 pin of the micro control module 1; the pins from 12 th to 14 th of the micro control module 1 are used as control terminal pins and connected with the pin 14 of the displacement cache module 4 of each voltage acquisition circuit 2, and the

pins

12, 13 th and 14 th of the displacement cache modules 4 of the other voltage acquisition circuits 2 are connected with the micro control module 1 through the level conversion circuit 5 respectively except for the first-stage voltage acquisition circuit 2.

As further shown in fig. 3 to 5, the analog front end module 3 employs an IC chip with a model number "PT 6111"; the No. 12 pin to the No. 19 pin of the analog front-end module 3 of each voltage acquisition circuit 2 are respectively and independently connected with the No. 15 pin, the No. 7 pin, the No. 6 pin, the No. 5 pin, the No. 1 pin, the No. 4 pin, the No. 3 pin and the No. 2 pin of the corresponding displacement cache module 4; and the No. 11 pin of the analog front-end module 3 of the upper-stage voltage acquisition circuit 2 is connected with the No. 11 pin of the displacement cache module 4 of the lower-stage voltage acquisition circuit 2 for cascade switching.

As further shown in fig. 6, the system further includes a power management module 6, where the power management module 6 is connected to a main power supply, and outputs the main power supply after voltage reduction to the micro control module 1 and other peripheral modules connected to the micro control module 1 to supply power, and the 18 th pin and the 8 th pin of the micro control module 1 are connected to the power management module 6.

As further shown in fig. 7, the current detection module 7 for collecting charging and discharging current in the circuit is further included, the current detection module 7 adopts an operational amplifier chip with the model number "TP 199a 1-CR", and the pin No. 4 of the current detection module 7 is connected with the pin No. 19 of the micro control module 1.

As further shown in fig. 8, the micro-control module further includes a short-circuit detection module 8 for detecting a short-circuit state, where the short-circuit detection module 8 is connected to the pin 11 and the pin 20 of the micro-control module 1.

As further shown in fig. 9, the battery further includes a bluetooth module 9, where the bluetooth module 9 is responsible for playing the charging and discharging information of the lithium battery cell 12 through network data; the Bluetooth module 9 adopts a "beacon" type Bluetooth chip; no. 12 pin of the Bluetooth module 9 is connected with No. 2 pin of the micro control module 1.

As further shown in fig. 10, the micro-control module further includes a MOSFET driving module 10, where the MOSFET driving module 10 is used to turn on or turn off a charge-discharge circuit, and the MOSFET driving module 10 is connected to the pin 1 and the pin 3 of the micro-control module 1; the MOSFET driving module 10 is also turned off and locked by the short circuit detection module 8.

As further shown in fig. 11, the load detection module 11 is further included, the load detection module 11 is configured to detect a load removal condition of the MOSFET driving module 10 in an off state, and the load detection module 11 is connected to pin No. 15 of the micro control module 1.

The system work flow is shown in figure 1:

after the micro control module 1 is powered on, a control signal is output, enters the voltage acquisition circuit 2, passes through the level conversion circuit 5 and the displacement cache module 4 and is output to the analog front-end module 3, and voltage acquisition and numerical value conversion of a single lithium battery cell 12 are completed by switching the analog front-end module 3 (see 'the specific embodiment of the voltage acquisition circuit as follows' in a detailed flow);

the micro-control module 1 collects current data at fixed time, the zero value is assumed to be Vzero, the gain is assumed to be Igain, the sampling resistance is Vsamp of the voltage value collected by the Rsamp micro-control module 1, if Vsamp is greater than Vzero, the voltage value is defined as a discharging current, otherwise, the voltage value is a charging current, and the actual current value I is | Vsamp-Vzero |/Igain/Rsamp;

after the micro control module 1 obtains the voltage and current values, the residual electric quantity of the battery is calculated;

after the micro control module 1 obtains the voltage and current values, whether the battery has overvoltage, undervoltage, overcurrent and other protections is diagnosed according to set alarm and protection parameters, and in addition, hardware failure, MOSFET driving module 10 failure and the like are diagnosed according to battery data and state parameters;

when discharging overcurrent or short circuit occurs, whether the load is an external short circuit or a capacitive load is detected through the short circuit detection module 8; if the short circuit is detected, whether the load is removed is detected through the short circuit detection module 8, and after the load is removed, the overcurrent or short circuit state is cleared; if the short circuit is detected by mistake due to the capacitive load, the external capacitive load can be charged by pre-discharging, and the discharging MOSFET driving module 10 is closed again after the external capacitive load is charged for a period of time (the detailed flow shows that the principle of the short circuit detection and load detection circuit is as follows);

when charging overcurrent occurs, whether discharging occurs or not is detected through the load detection module 11, and when the battery discharges, the charging overcurrent state is cleared;

when the lithium battery core 12 is in an undervoltage state, the micro control module 1 prohibits all the analog front end modules 3 from working, disconnects all power supplies such as the Bluetooth module 9, the current detection module 7 and the power supply of the micro control module 1, and enters a shutdown state, and at the moment, the power supplies can only be activated by charging;

when the micro control module 1 detects a standing state and is abnormal, the micro control module 1 prohibits all the analog front end modules 3 from working, turns off all the peripheral equipment, enters a dormant state, awakens collected voltage and current data regularly, sends the data through the Bluetooth module 9, and can only be awakened through charging and discharging current at the moment;

when the micro control module 1 detects that the equalization condition is met, the micro control module 1 outputs a control signal, the control signal is output to the displacement cache module 4 after passing through the level conversion circuit 5, and after the signal is latched, the analog front-end module 3 is output and controlled at the enabled displacement cache module 4, so that the start equalization is realized;

the micro control module 1 sends the data and the state of the lithium battery cell 12 to the Bluetooth module 9, and the Bluetooth module 9 broadcasts the data and the state;

the WeChat applet or the mobile terminal application program is connected with the Bluetooth module 9 in a code scanning mode, receives data sent by the Bluetooth module 9 and displays the data, and if the data are abnormal, the mobile device starts a vibration or voice broadcasting mode to remind a user.

The specific embodiment of the voltage acquisition circuit is as follows:

assuming that each analog front-end module 3 can collect at most N strings of lithium battery cells 12, the micro control module 1 first controls the first displacement buffer module 4U9 (fig. 5), controls the collection channel CS0_ L, CS1_ L, CS2_ L of the first IC chip U8 (fig. 5), enables EN _ L after selecting the channel, transmits the voltage of the lithium battery cell 12 from VOUT _ L of the analog front end to the micro control module 1, collects VOUT _ L voltage by the micro control module 1, and continuously controls the U8 to collect the highest string VB7 of the IC chip U8, where Vcell _ L is VOUT × Vgain, where Vcell _ L is the voltage of the lithium battery cell 12 of the first analog front-end module 3, VOUT _ L is the voltage of VOUT _ L, and Vgain is the voltage gain of the lithium battery cell 12;

the first IC chip U8 keeps CS0_ L, CS1_ L, CS2_ L high level to select the voltage acquisition circuit 2 of the highest level layer, and then controls CS0_ M, CS1_ M, CS2_ M of the second IC chip U5, the voltage data of the second IC chip U5 is transmitted to the position of the highest level layer VB8 of the first IC chip U8 through VOUT _ M, at this time, because the first IC chip U8 always selects the highest level layer voltage acquisition circuit 2, the VOUT _ L output voltage of the first IC chip U8 is the voltage of VOUT _ H after conversion; the voltage for the second IC chip U5 is converted to: vcell _ M is the voltage of the lithium battery cell 12 connected to the second IC chip U5, Vout is the voltage of Vout _ L, and Vgain is the voltage gain of the lithium battery cell 12;

the first IC chip U8 and the second IC chip U5 both maintain and select the highest level voltage acquisition circuit 2, and CS0_ L, CS1_ L, CS2_ L, CS0_ M, CS1_ M, CS2_ M both maintain high level, at this time, CS0_ H, CS1_ H, CS2_ H of the third IC chip U1 starts to be controlled, the voltage data of the third IC chip U5 is transmitted to the highest level position VB8 of the second IC chip U5 through VOUT _ H, the voltage data of the IC chip U5 is transmitted to the highest level position VB8 of the IC chip U5 through VOUT _ M, and the VOUT _ L output voltage of the first IC chip U8 is the VOUT _ H converted voltage; the voltage for the third IC chip U1 is converted to: vcell _ H is Vout × Vgain, where Vcell _ H is an access voltage of the second IC chip U5, Vout is a voltage of Vout _ L, and Vgain is a voltage gain of the lithium battery cell 12; the acquisition of M chips can be realized according to the logic, and the voltage acquisition of M x (N-1) +1 strings is realized; the above-mentioned acquisition sequence is only a hierarchical manner, and the actual acquisition sequence may start from any section.

Short-circuit detection and load detection circuit principle:

as shown in fig. 8 and 11, when the external load is short-circuited or switched into the capacitive load, the voltage of the negative electrode is equal to the total power voltage, the Q22 is turned on by the divided voltage of R94, the SC _ DSG level is pulled down to the ground, so as to lock the discharging MOSFET driving module 10, and at this time, the discharging MOSFET driving module 10 is not controlled by the micro control module 1, so as to prevent the discharging MOSFET driving module 10 from being turned on by mistake when the micro control module 1 fails; the SC _ DSG signal is output to a signal pin of the micro control module 1 to trigger external interruption, and after the micro control module 1 receives an interruption signal, the unlock outputs a high-level deadlock Q22; after short-circuit protection, the micro-control module 1 outputs a high level to a DIS _ EN pin, Q35, Q34 and Q42 are respectively conducted, load is pre-discharged through R132, the micro-control module 1 samples voltage through VD _ VSC, and whether an external load is a short circuit or a capacitive load is judged through voltage drop of the VD _ VSC; if the load is a capacitive load, the micro control module 1 controls the unlock of the discharging MOSFET driving module 10 again; if the short circuit is detected, the state of deadlock of the MOSFET driving module 10 is maintained, VD _ VSC voltage is detected to judge whether the load is removed, and if the load is removed, the micro control module 1 controls unlock of the discharging MOSFET driving module 10 again.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims

1. The utility model provides a lithium battery management system, includes little control module, its characterized in that still includes a N voltage acquisition circuit of gathering lithium cell electricity core information, and voltage acquisition circuit includes simulation front end module and displacement cache module, every simulation front end module of a N voltage acquisition circuit cascades with little control module through corresponding displacement cache module, realizes that chronogenesis switching voltage acquisition circuit monitors the management to every electric core of lithium cell to except that first level voltage acquisition circuit, still be connected with level conversion circuit between all the other voltage acquisition circuit's displacement cache module and the little control module.

2. The lithium battery management system of claim 1, wherein the micro control module is of type ″ "N76E003AT20"is used as a control chip.

3. The lithium battery management system of claim 2, wherein the displacement cache module adopts a displacement register chip with the model number "SN 74HC595 DR", and the No. 12 pin of the displacement cache module is connected with the No. 16 pin of the micro control module; the No. 13 pin of the displacement cache module is also connected with the No. 17 pin of the micro control module; and the No. 12 pin to the No. 14 pin of the micro control module are used as control end pins and are connected with the No. 14 pin of the displacement cache module of each voltage acquisition circuit, and the No. 12 pin, the No. 13 pin and the No. 14 pin of the displacement cache modules of the other voltage acquisition circuits are connected with the micro control module in common through level conversion circuits except for the first-stage voltage acquisition circuit.

4. The lithium battery management system of claim 3, wherein the analog front end module is an IC chip with a model number of "PT 6111"; the No. 12 pin to the No. 19 pin of the analog front-end module of each voltage acquisition circuit are respectively and independently connected with the No. 15 pin, the No. 7 pin, the No. 6 pin, the No. 5 pin, the No. 1 pin, the No. 4 pin, the No. 3 pin and the No. 2 pin of the corresponding displacement cache module; and the No. 11 pin of the analog front-end module of the upper-stage voltage acquisition circuit is connected with the No. 11 pin of the displacement cache module of the lower-stage voltage acquisition circuit for cascade switching.

5. The lithium battery management system of claim 2, further comprising a power management module, wherein the power management module is connected to the main power source, and outputs the main power source after voltage reduction to the micro control module and other peripheral modules connected to the micro control module for power supply, and pin 18 and pin 8 of the micro control module are connected to the power management module.

6. The lithium battery management system of claim 2, further comprising a current detection module for collecting charging and discharging current in the circuit, wherein the current detection module adopts an operational amplifier chip with the model number "TP 199A 1-CR", and the No. 4 pin of the current detection module is connected with the No. 19 pin of the micro control module.

7. The lithium battery management system of claim 2, further comprising a short detection module for detecting a short circuit condition, wherein the short detection module is connected to pin No. 11 and pin No. 20 of the micro control module.

8. The lithium battery management system according to claim 2, further comprising a bluetooth module, wherein the bluetooth module is responsible for playing the charging and discharging information of the lithium battery cell through network data; the Bluetooth module adopts a beacon-like Bluetooth chip; no. 12 pin of the Bluetooth module is connected with No. 2 pin of the micro control module.

9. The lithium battery management system according to claim 7, further comprising a MOSFET driver module, wherein the MOSFET driver module is configured to turn on or turn off the charge/discharge circuit, and is connected to pin No. 1 and pin No. 3 of the micro control module; and the MOSFET driving module is also used for carrying out turn-off locking through the short circuit detection module.

10. The lithium battery management system of claim 9, further comprising a load detection module, wherein the load detection module is configured to detect removal of a load from the MOSFET driver module in an off state, and the load detection module is connected to pin No. 15 of the micro control module.